| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | it has [been] [verb] [prep] a | 144 |
|
| 2 | it has been [verb] [prep] a | 144 |
|
| 3 | it has [been] [vb pp] [prep] a | 141 |
|
| 4 | it has [been] [verb] as a | 47 |
|
| 5 | it has [been] [verb] by a | 21 |
|
| 6 | it has [been] [verb] to a | 17 |
|
| 7 | it has [been] [verb] in a | 12 |
|
| 8 | it has [been] [verb] into a | 12 |
|
| 9 | it has [been] used [prep] a | 11 |
|
| 10 | it has [been] use [prep] a | 11 |
|
| 11 | it has [been] [verb] on a | 10 |
|
| 12 | it has [been] [verb] for a | 10 |
|
| 13 | it has [been] described [prep] a | 6 |
|
| 14 | it has [been] describe [prep] a | 6 |
|
| 15 | it has [been] known [prep] a | 5 |
|
| 16 | it has [been] [verb] at a | 5 |
|
| 17 | it has [been] know [prep] a | 5 |
|
| 18 | it has [been] [verb] with a | 5 |
|
